Oh no no, sitrus only recover 25% from your hp, and almost all of the little cup pokemon have around 20 (not fro munchlax and any epic health pokemon) so if you use sitrus you only get around 5 or 6 hp, and if you use oran, you'll get 10 health, around half of the pokemon's health...

DT, Sitrus Berry only restored 30 HP in Gen III, taking the place of Gen II's Gold Berry. It was changed in Gen IV to become 25% of health is regained. If it was 30 HP, it would become a banned item like Berry Juice.

giga drain/ glare/ mean look/taunt-Giga Drain lets it recover health, but doesn't offer as much coverage due to you already having LS; Glare is there to cripple the opponent; Mean look traps the foe if needed, and taunt prevents them from setting up on you.

Maxed Speed, and maxed HP, which provides respectable bulk along with Eviolite. Leaf Storm will quickly raise your Special Attack. Glare will quickly fix your Speed so you can take on Scarfs and Dancers with ease. HP Rock provides type coverage. Giga Drain provides healing while also giving you more PP, as Leaf Storm is lacking in that regard. However, Twister can be used to take down Dratini as DT said. This is only worth mentioning because Dratini is currently one of the most used Pokemon in LC.